Fr. Al Kimmel made an intriguing comment in a discussion on the Anatasis Dialog Blog here

"What the Catholic Church can do, though, is to reinterpret her dogmatic definitions in light of a greater whole, as Balthasar notes. This is precisely what happens in the history of dogma. An ecumenical council may speak a definitive word, yet not a final word. Doctrine lives forward. Ephesus needed to be followed by Chalcedon, lest it be misunderstood; and Chalcedon needed to be followed by the second and third councils of Constantinople."

and then went on to quote a most interesting statement from then Cardinal Ratzinger:

"Yet ... there is a "yet" and therein lies the ecumenical hope. If there were no "yet," Cardinal Ratzinger could not have tendered his startling 1982 proposal:

"Rome must not require more from the East with respect to the doctrine of primacy than had been formulated and was lived in the first millennium. … Reunion could take place in this context if, on the one hand, the East would cease to oppose as heretical the developments that took place in the West in the second millennium and would accept the Catholic Church as legitimate and orthodox in the form she had acquired in the course of that development, while, on the other hand, the West would recognize the Church of the East as orthodox and legitimate in the form she has always had."